Hi... Sometimes (often) when searching for a part number on RealOEM or bmwfans there are no results.

Is there an additional resource that has all parts? old vs. new part numbers? a cross reference list somewhere that exists?

Not only have a I pulled a part directly from my vehicle and typed in the part number from the sticker (see below), but frequently when sourcing parts from ebay or other they also do not show up... am i doing something wrong?

This part is in my car, recently removed and if you type this number in it does not appear anywhere, for any vehicle on realoem or bmwfans:

So with that part you have shown, what is on the sticker is probably the ATE part number. Realoem shows the BMW part number. It is very common from car manufacturers to have different numbers for a part than the manufacturer of the part.

For instance, with certain bosch part numbers. You can often look up just the bosch part number and get the parts much cheaper than if you buy the BMW specific part. However, some things, like wiring for instance, might be different if you don't buy the BMW specific part. Bosch O2 sensor for instance.

Although, the BMW part numbers for an ABS/ASC controller are very similar to that... Not sure why they would be different. Did you enter the correct year, body style, and geographic area for the car?

Also, try putting the part number into google and see what you find. I found this-

"Genuine BMW - #34521164137 - CONTROL UNIT ES#220152 Part has been superceeded by ES#63039"

So with that part you have shown, what is on the sticker is probably the ATE part number. Realoem shows the BMW part number. It is very common from car manufacturers to have different numbers for a part than the manufacturer of the part.

I see, but I have now typed in several part numbers from several of these ATE controllers (as I am seeking a replacement) and most of them do show up, with a similar sticker. For example, this one shows up (blue label): 34521164320 but the brown label doesn't. Perhaps it is the obsolete part numbers that don't show (the ones that have been "superseded"). I wish there was a cross reference somewhere but that ECS Tuning website seems to be a good start. Thanks!

Funny note: when I google for the part number now this thread is the top return.

At first I thought it wasn't a BMW part number, but when I looked at how close that number is to what is listed for a 97 with ASC/ABS I knew it had to be superceded. That ECStuning was the only place that lists it as superceded, but not sure what their part number means.

Indeed Pelican lists it as superseded too. The ECS part number is the number that actually does show up in RealOEM (ends in 899). But I guess RealOEM and bmwfans does not list superseded parts, so Pelican or ECS it is. Good to know. Thanks for all the help everyone.

thanks Mallard! I was able to find the brown one used, but it seems my problem was not the ABS controller at all, still trying to track it down (the problem, not the part, that is). The blue one doesn't fit my car of course.